Publication: Micro- y nanoestructuras de ZnO dopado con metales : síntesis y crecimiento ordenado sobre sustratos estructurados por láser
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2022-11-23
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Universidad Complutense de Madrid
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Abstract
En el presente trabajo de investigación se aborda la síntesis de micro- y nanoestructuras de ZnO dopado con diferentes elementos metálicos con el fin de estudiar sus propiedades y potenciales aplicaciones en dispositivos optoelectrónicos y de fotocatálisis. A tal fin, se ha analizado también la posibilidad de controlar espacialmente su crecimiento selectivo sobre diversos tipos de sustratos previamente estructurados con pulsos láser ultracortos. El ZnO es un semiconductor de banda ancha perteneciente al grupo de óxidos conductores trasparentes (Transparent Conductive Oxides, TCOs) cuyas propiedades resultan de especial interés para distintas aplicaciones. Se sabe que el uso de dopantes adecuados permite modificar y potenciar de manera muy significativa algunas de sus propiedades, especialmente eléctricas, ópticas y luminiscentes. Es por ello por lo que se ha estudiado cómo influye el dopado con distintos metales alcalinos (Li, K) y de transición (Zr) en las propiedades de las micro- y nanoestructuras sintetizadas mediante el método vapor – sólido (VS).Esta técnica de crecimiento permite obtener estructuras con una muy buena calidad cristalina y no hace uso de catalizadores, lo cual evita la incorporación de impurezas no deseadas en las estructuras. Se han realizado diferentes ensayos decrecimiento encaminados a optimizar el proceso para cada dopante variando tanto las condiciones de los tratamientos térmicos como mediante el empleo de diferentes precursores y el uso de diferentes niveles de dopado. Estos ensayos se han retroalimentado mediante las diferentes técnicas de caracterización empleadas, de naturaleza morfológica, composicional, estructural y óptica...
This research work is focused on the synthesis of micro- and nanostructures of ZnO doped with different metallic elements with the aim of assessing their properties and potential applications in optoelectronic and photocatalytic devices.To this end, the possibility of spatially controlling their selective growth on various types of substrates previously structured with ultrashort laser pulses has also been analysed.ZnO is a broadband semiconductor belonging to the group of transparen tconductive oxides (TCO´s) whose properties are of special interest for differentapplications. It is known that the use of suitable dopants makes it possible to very significantly modify and enhance some of its properties, especially electrical, optical and luminescent ones. This is the underlying reason for analysing how doping with different alkali (Li, K) and transition (Zr) metals influences the properties of micro- and nanostructures synthesized by the vapor-solid (VS) method. This growth technique allows to obtain structures with very good crystalline quality and does not use catalysts, which avoids the incorporation of unwanted impurities in the generated structures. Different tests have been carried out aimed at optimizing the growth process for each dopant, varying both the conditions of the thermal treatments, through the use of different precursors, and the use of different levels of doping. These tests have been fed back through the different characterization techniques used, of a morphological, compositional, structural and optical nature...
This research work is focused on the synthesis of micro- and nanostructures of ZnO doped with different metallic elements with the aim of assessing their properties and potential applications in optoelectronic and photocatalytic devices.To this end, the possibility of spatially controlling their selective growth on various types of substrates previously structured with ultrashort laser pulses has also been analysed.ZnO is a broadband semiconductor belonging to the group of transparen tconductive oxides (TCO´s) whose properties are of special interest for differentapplications. It is known that the use of suitable dopants makes it possible to very significantly modify and enhance some of its properties, especially electrical, optical and luminescent ones. This is the underlying reason for analysing how doping with different alkali (Li, K) and transition (Zr) metals influences the properties of micro- and nanostructures synthesized by the vapor-solid (VS) method. This growth technique allows to obtain structures with very good crystalline quality and does not use catalysts, which avoids the incorporation of unwanted impurities in the generated structures. Different tests have been carried out aimed at optimizing the growth process for each dopant, varying both the conditions of the thermal treatments, through the use of different precursors, and the use of different levels of doping. These tests have been fed back through the different characterization techniques used, of a morphological, compositional, structural and optical nature...
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Tesis inédita de la Universidad Complutense de Madrid, Facultad de Ciencias Físicas, leída el 29-04-2022